Displacement sensor and distance measuring device

Abstract

The application relates to the technical field of sensors. In view of the problem of inaccurate measurement information of a displacement sensor in remote displacement detection in the prior art, the application provides a displacement sensor and a distance measuring device. The displacement sensor comprises a shell, the shell comprising a base body, a base and a top cover; the base body is a hollow cavity structure with two open ends; the base and the top cover are arranged at the two open ends of the base body; a main body is arranged in the shell; the main body comprises a circuit board, a filter board, a pulse board, a sensitive element and a mounting bracket; the circuit board and the pulse board are connected; the pulse board and the sensitive element are connected; the filter board and the circuit board are connected; a measuring rod assembly comprises a measuring rod, a position sensing element and a magnetic ring; the position sensing element is arranged in the interior of the measuring rod, the magnetic ring is sleeved on the outer periphery of the measuring rod and can move along the measuring rod. The displacement sensor can generate an excitation pulse during detection and filter out interference signals, thereby facilitating improvement of the measurement accuracy.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and more specifically, to a displacement sensor and a ranging device. Background Technology

[0002] Magnetostrictive displacement sensors accurately measure the actual displacement of a product by detecting the absolute position of a moving magnetic ring using internal non-contact measurement and control technology. The sensor's high accuracy and reliability have led to its widespread application in thousands of real-world cases. Because the moving magnetic ring and the sensing element do not directly contact each other, the sensor can be used in extremely harsh industrial environments and is not easily affected by oil, solutions, dust, or other contaminants. Furthermore, the sensor employs high-tech materials and advanced electronic processing technology, enabling it to operate in high-temperature, high-pressure, and high-vibration environments. The sensor output signal is an absolute displacement value; data is not lost even after power interruption and reconnection, and there is no need to reset to zero. Since the sensing element is non-contact, repeated measurements will not cause any wear to the sensor, significantly improving detection reliability and lifespan.

[0003] However, in practical use, when the magnetostrictive displacement sensor of the relevant technology is used for remote displacement detection, its echo signal will be weakened due to the distance, resulting in inaccurate measurement information. Utility Model Content

[0004] To address the technical problem of inaccurate measurement information from displacement sensors during remote displacement detection in related technologies.

[0005] The first aspect of this application is to provide a displacement sensor;

[0006] The second aspect of this application is to propose a ranging device.

[0007] In view of the above, according to the first aspect of this application, a displacement sensor is proposed, comprising: a housing, the housing including a base, a base and a top cover; the base is a hollow cavity structure with openings at both ends; the base and the top cover are respectively disposed at the openings at both ends of the base; a main body disposed within the housing; the main body including a circuit board, a filter plate, a pulse plate, a sensitive element and a mounting bracket; the circuit board and the pulse plate are disposed opposite each other on both sides of the mounting bracket and connected to the mounting bracket, the circuit board and the pulse plate being connected; the filter plate is disposed above the mounting bracket and connected to the circuit board; the sensitive element is connected to the mounting bracket and located between the circuit board and the pulse plate, the sensitive element and the pulse plate being connected; a measuring rod assembly, the measuring rod assembly including a measuring rod, a position sensing element and a magnetic ring; the measuring rod is hollow inside and connected to the base; the position sensing element is disposed inside the measuring rod and connected to the sensitive element, the magnetic ring is sleeved on the outer periphery of the measuring rod and can move along the measuring rod.

[0008] In the above technical solution, when the magnetic ring moves on the measuring rod, the position sensing element senses the change in the position of the magnetic ring and outputs a corresponding sensing signal; the sensing element is used to receive the sensing signal and convert it into an electrical signal; the pulse board is used to generate excitation pulses and receive the echo signal returned by the sensing element, process the echo signal and transmit it to the circuit board; the circuit board processes the echo signal sent by the pulse board, converts the echo signal into a displacement signal and sends it to the filter board; the filter board is responsible for processing the level signal.

[0009] This displacement sensor generates excitation pulses during detection and filters out interference signals, thereby improving measurement accuracy. Furthermore, the circuit board and pulse board are positioned opposite each other, with the filter board positioned above the mounting bracket. This design simplifies connections and facilitates wiring. Simultaneously, the relatively large spacing increases electrical safety distances and creepage distances, allowing the displacement sensor to adapt to harsh environments such as high altitudes and low air pressure.

[0010] In some technical solutions, optionally, the mounting bracket includes: a base plate connected to a base; a first positioning groove provided on the end face of the base plate, the first positioning groove penetrating the base plate; a vertical plate having a first end, a second end, and at least three clearance positions; the first end being connected to the end face of the base plate away from the base, and the second end contacting the top cover; two of the at least three clearance positions being respectively disposed at the first end and the second end; wherein, the circuit board and the pulse board are disposed on both sides of the vertical plate; and the sensitive element is disposed at the first positioning groove.

[0011] In practical applications, the guidance and restriction of the first positioning groove provides a clear installation position for the sensitive element, which not only facilitates assembly but also improves the accuracy and stability during the installation process. Furthermore, by designing at least three clearance spaces for wiring, sufficient space is provided for the wiring between the circuit board, filter board, pulse board and sensitive element, making the wiring smooth and neat, thereby avoiding unnecessary squeezing or pulling of the wiring.

[0012] In some technical solutions, the mounting bracket may optionally include two sets of fixing seats; the two sets of fixing seats are respectively disposed on both sides of the vertical plate; the fixing seat set includes at least two fixing seats; the circuit board and the pulse board are respectively connected to the fixing seats located on both sides of the vertical plate.

[0013] The mounting brackets securely fix the circuit board and pulse board to both sides of the vertical plate, improving the overall stability of the mounting bracket and thus helping to reduce the impact of vibration and shock on the displacement sensor performance. Simultaneously, the brackets create a certain gap between the circuit board and pulse board and the vertical plate, facilitating wiring and allowing operators to easily inspect and adjust the wiring during assembly and maintenance, thereby reducing equipment failure rates caused by wiring problems. Furthermore, the increased relative distance between the circuit board and pulse board enhances safety.

[0014] In some technical solutions, the displacement sensor may optionally include an insulating pad; the insulating pad is disposed between the sensitive element and the base.

[0015] In the above technical solution, the insulating pad can effectively isolate the sensitive element from the base to prevent current from flowing between them, while also providing additional mechanical support to enhance the stability of the sensitive element during installation.

[0016] In some technical solutions, the mounting bracket may optionally include a second positioning groove; the second positioning groove is disposed around the periphery of the first positioning groove.

[0017] In practical applications, by designing a second positioning groove, an installation position is provided for the insulating pad, which can be quickly and accurately installed into the predetermined position, thereby greatly simplifying the assembly process and improving assembly efficiency.

[0018] In some technical solutions, stepped surfaces may be provided on both sides of the second end of the vertical plate.

[0019] By designing a stepped surface, a gap is formed between the stepped surface and the top cover, which facilitates the installation of the top cover.

[0020] In some technical solutions, the probe assembly may optionally include an end; the end is located at the end of the probe away from the base.

[0021] In the above technical solution, the measuring rod and the end form a complete and sealed structure, which can prevent external media from entering the interior of the measuring rod and affecting the position sensing element, thereby helping to improve the reliability and service life of the entire displacement sensor.

[0022] In some technical solutions, the probe assembly may optionally include a non-magnetic pad, which is located on the side of the magnetic ring away from the base.

[0023] During magnetic ring installation, non-magnetic pads can act as an isolation layer to isolate the components, thereby preventing direct contact between the components and the magnetic ring from affecting the magnetic properties of the magnetic ring and ensuring the measurement accuracy of the displacement sensor.

[0024] In some technical solutions, the displacement sensor may optionally include a connecting wire and a waterproof connector; the waterproof connector is located on the top cover, and the connecting wire is connected to the filter plate through the waterproof connector.

[0025] Waterproof connectors ensure that the clean signal processed by the filter board is stably transmitted to external devices. This connection method is not only stable and reliable, but also easy to maintain and replace, and helps to improve the measurement accuracy and stability of displacement sensors.

[0026] According to a second aspect of this application, a ranging device is proposed, comprising a displacement sensor as proposed in the first aspect of this application. This ranging device has the displacement sensor proposed in any of the above-described technical solutions, and thus possesses all the beneficial effects of any of the above-described technical solutions, which will not be elaborated further here.

[0027] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 One of the structural schematic diagrams of the displacement sensor in an embodiment of this application is shown;

[0030] Figure 2 A second schematic diagram of the displacement sensor in an embodiment of this application is shown;

[0031] Figure 3 One of the structural schematic diagrams of the mounting bracket in an embodiment of this application is shown;

[0032] Figure 4 The second schematic diagram of the mounting bracket in an embodiment of this application is shown.

[0033] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0034] 100 Housing; 110 Base; 120 Base; 130 Top Cover; 200 Main Body; 210 Circuit Board; 220 Filter Board; 230 Pulse Board; 240 Sensing Element; 250 Mounting Bracket; 251 Base Plate; 2511 First Positioning Groove; 2512 Fixing Through Hole; 252 Vertical Plate; 2521 First End; 2522 Second End; 2523 Clearance; 2524 Stepped Surface; 253 Fixing Seat Assembly; 2531 Fixing Seat; 254 First Connector; 255 Second Positioning Groove; 256 Second Connector; 300 Measuring Rod Assembly; 310 Measuring Rod; 320 Position Sensing Element; 330 Magnetic Ring; 340 End; 350 Non-Magnetic Pad; 400 Insulating Pad; 500 Connecting Wire; 600 Waterproof Connector; 700 Protective Tube. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0037] The following is combined with Figures 1 to 4 The displacement sensor and ranging device provided in this application will be described in detail through specific embodiments and application scenarios.

[0038] Reference Figure 1 and Figure 2 The embodiments of this application provide a displacement sensor, the structure of which includes: a housing 100, a main body 200 and a measuring rod assembly 300.

[0039] Specifically, the outer shell 100 includes a base 110, a base 120, and a top cover 130; wherein, the base 110 is a hollow cavity structure with openings at both ends; the base 120 and the top cover 130 are respectively disposed at the openings at both ends of the base 110 to close the base 110.

[0040] The main body 200 is disposed within the outer casing 100, specifically within the enclosed space formed by the base 110, the base 120, and the top cover 130. The main body 200 includes a circuit board 210, a filter board 220, a pulse board 230, a sensitive element 240, and a mounting bracket 250. Specifically, the circuit board 210 and the pulse board 230 are disposed opposite each other on both sides of the mounting bracket 250 and connected to it; the filter board 220 is located above the mounting bracket 250 and connected to the circuit board 210; the sensitive element 240 is connected to the mounting bracket 250 and located between the circuit board 210 and the pulse board 230, and is also connected to the pulse board 230.

[0041] The probe assembly 300 includes a probe 310, a position sensing element 320, and a magnetic ring 330. The probe 310 is hollow inside and connected to the base 120; the position sensing element 320 is disposed inside the probe 310 and connected to the sensing element 240; the magnetic ring 330 is sleeved on the outer periphery of the probe 310 and can move along the probe 310.

[0042] In the above embodiment, when the magnetic ring 330 moves on the measuring rod 310, the position sensing element 320 senses the position change of the magnetic ring 330 and outputs a corresponding sensing signal; the sensing element 240 receives the sensing signal and converts it into an electrical signal; the pulse plate 230 generates an excitation pulse and receives the echo signal returned by the sensing element 240, processes the echo signal, and transmits it to the circuit board 210; the circuit board 210 processes the echo signal sent by the pulse plate 230, converts the echo signal into a displacement signal, and sends it to the filter plate 220; the filter plate 220 is responsible for processing the level signal; this displacement sensor can generate an excitation pulse and filter out interference signals during detection, thereby improving the accuracy of the measurement. Furthermore, the circuit board 210 and the pulse plate 230 are arranged opposite each other, and the filter plate 220 is positioned above the mounting bracket 250. This design makes the connection between them simpler and easier to wire. At the same time, the relatively large spacing increases the electrical safety distance and creepage distance, allowing the displacement sensor to adapt to harsh environments such as high altitude and low air pressure.

[0043] In practical applications, the sensing element 240 includes sensing components, identification components, amplification components, calculation components, output circuits, and a mechanical housing.

[0044] The outer casing 100 is made entirely of stainless steel. The base 120 and the top cover 130 are connected and fixed to the base 110 by welding; it is understood that they can also be connected by a detachable connection, but this embodiment is not limited thereto.

[0045] Reference Figure 2 and Figure 3 In some embodiments, the mounting bracket 250 includes a base plate 251 and a vertical plate 252. Specifically, the base plate 251 is connected to the base 120, and a first positioning groove 2511 is provided on the end face of the base plate 251, which penetrates through the base plate 251. The vertical plate 252 has a first end 2521, a second end 2522, and at least three clearance positions 2523; wherein, the first end 2521 is connected to the end face of the base plate 251 away from the base 120, the second end 2522 contacts the top cover, and two of the at least three clearance positions 2523 are respectively provided at the first end 2521 and the second end 2522.

[0046] In practical applications, the sensitive element 240 is disposed at the first positioning groove 2511, the circuit board 210 and the pulse board 230 are disposed opposite each other on both sides of the vertical plate 252, the sensitive element 240 and the pulse board 230 are routed through the clearance 2523 at the first end 2521, the filter board 220 and the circuit board 210 are routed through the clearance 2523 at the second end 2522, and the pulse board 230 and the circuit board 210 are routed through the clearance 2523 located between the first end 2521 and the second end 2522.

[0047] In the above embodiment, the first positioning groove 2511 provides a clear installation position for the sensitive element 240, which not only facilitates assembly but also improves the accuracy and stability during the installation process. Furthermore, by designing at least three clearance positions 2523 for wiring, sufficient space is provided for the wiring between the circuit board 210, filter board 220, pulse board 230 and sensitive element 240, making the wiring smooth and neat, thereby avoiding unnecessary squeezing or pulling of the wiring.

[0048] In some embodiments, the mounting bracket 250 further includes two sets of fixing base groups 253. The two sets of fixing base groups 253 are respectively disposed on both sides of the vertical plate 252 for fixing the circuit board 210 and the pulse board 230. Specifically, each set of fixing base groups 253 includes at least two fixing bases 2531; the circuit board 210 and the pulse board 230 are respectively connected to the fixing bases 2531 located on both sides of the vertical plate 252.

[0049] In the above embodiment, the circuit board 210 and the pulse board 230 are firmly fixed to both sides of the vertical plate 252 by the fixing base 2531, which improves the stability of the entire mounting bracket 250 and helps to reduce the impact of vibration and shock on the performance of the displacement sensor. At the same time, the fixing base 2531 ensures that there is a certain gap between the circuit board 210 and the pulse board 230 and the vertical plate 252, which facilitates wiring and allows operators to check and adjust the wiring during assembly and maintenance, thereby reducing the equipment failure rate caused by wiring problems. It also further increases the relative distance between the circuit board 210 and the pulse board 230, resulting in higher safety.

[0050] In practical applications, the mounting base 2531 is provided with pre-fixed holes, and the circuit board 210 and the pulse board 230 are connected to the mounting base 2531 through the first connector 254 (such as bolts, locating pins, or self-tapping screws). In this embodiment, the first connector 254 is a self-tapping screw, which helps to save mold opening costs.

[0051] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the displacement sensor also includes an insulating pad 400. The insulating pad 400 is disposed between the sensing element 240 and the base 120. The insulating pad 400 not only effectively isolates the sensing element 240 from the base 120 to prevent current from flowing between them, but also provides additional mechanical support, enhancing the stability of the sensing element 240 during installation.

[0052] In the above embodiment, the mounting bracket 250 further includes a second positioning groove 255. The second positioning groove 255 is disposed around the periphery of the first positioning groove 2511.

[0053] In practical applications, by designing the second positioning groove 255, an installation position is provided for the insulating pad 400, which allows the insulating pad 400 to be installed quickly and accurately into the predetermined position, thereby greatly simplifying the assembly process and improving assembly efficiency.

[0054] In some embodiments, stepped surfaces 2524 are provided on both sides of the second end 2522 of the vertical plate 252; thereby providing an installation position for the top cover 130, which not only helps to improve the stability of the top cover 130, but also simplifies the installation process and reduces the installation difficulty to a certain extent.

[0055] In some embodiments, the base plate 251 is provided with a fixing through hole 2512. During actual installation, the base plate 251 and the base 120 are connected by corresponding second connectors 256 (positioning pins, bolts) to securely install the mounting bracket 250 on the base 120.

[0056] In the above embodiment, the fixing through hole 2512 is a countersunk hole. The countersunk hole structure allows the head of the second connector 256 to be recessed into the hole, thereby avoiding protrusion from the surface of the base plate 251. This not only prevents the head of the second connector 256 from interfering with other components, but also ensures the flatness of the surface of the mounting bracket 250, which is beneficial for the subsequent installation and layout of components.

[0057] In some embodiments, the probe assembly 300 further includes an end 340. The end 340 is disposed at the end of the probe 310 away from the base 120 to close the probe 310.

[0058] In the above embodiment, the measuring rod 310 and the end 340 form a complete, sealed structure, which can prevent external media from entering the interior of the measuring rod 310 and affecting the position sensing element 320, thereby helping to improve the reliability and service life of the entire displacement sensor.

[0059] In practical applications, the end cap 340 and the measuring rod 310 are welded together. The measuring rod 310 and the base 120 are welded together.

[0060] In some embodiments, a fluorine tube is fitted inside the measuring rod 310, and the position sensing element 320 is disposed inside the fluorine tube. The fluorine tube has excellent insulation properties, which helps to reduce the influence of electromagnetic interference on the position sensing element 320, thereby improving the accuracy and stability of the measurement.

[0061] In some embodiments, the probe assembly 300 further includes a non-magnetic pad 350; the non-magnetic pad 350 is disposed on the side of the magnetic ring 330 away from the base 120.

[0062] During actual installation, the material, shape, and position of the components may potentially affect the magnetism of the magnetic ring 330. The introduction of the non-magnetic pad 350, however, acts as an isolation layer during magnetic ring 330 installation, preventing direct contact between the components and the magnetic ring 330 and thus ensuring the accuracy of the displacement sensor's measurements.

[0063] In some embodiments, the displacement sensor further includes a connecting wire 500 and a waterproof connector 600. The waterproof connector 600 is disposed on the top cover 130, and the connecting wire 500 is connected to the filter plate 220 through the waterproof connector 600.

[0064] In the above embodiments, the waterproof connector 600 can ensure that the pure signal processed by the filter board 220 is stably transmitted to the external device. This connection method is not only stable and reliable, but also easy to maintain and replace, and helps to improve the measurement accuracy and stability of the displacement sensor.

[0065] In practical applications, the end of the waterproof connector 600 located inside the top cover 130 is filled with adhesive to ensure a waterproof seal.

[0066] In some embodiments, the displacement sensor further includes a protective tube 700. The protective tube 700 is sleeved around the position sensing element 320, and one end is connected to the sensing element 240.

[0067] In the above embodiment, the protective tube 700 provides additional protection for the connection between the sensitive element 240 and the position sensing element 320, thereby helping to extend the service life of the displacement sensor and ensure its measurement accuracy and stability.

[0068] In some embodiments, this application also proposes a ranging device having the displacement sensor described in any of the above embodiments. Thus, the ranging device possesses all the beneficial effects of any of the above embodiments, which will not be elaborated further here.

[0069] It should be clarified that in the claims, description, and accompanying drawings of this application, the term "multiple" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood based on the specific circumstances of the above data.

[0070] In the claims, description, and accompanying drawings of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In the claims, description, and accompanying drawings of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A displacement sensor, characterized in that, include: The outer shell includes a base, a base, and a top cover; the base is a hollow cavity structure with openings at both ends; the base and the top cover are respectively disposed at the openings at both ends of the base; The main body is disposed within the housing; the main body includes a circuit board, a filter board, a pulse board, a sensitive element, and a mounting bracket; the circuit board and the pulse board are disposed opposite to each other on both sides of the mounting bracket and connected to the mounting bracket, and the circuit board and the pulse board are connected. The filter board is disposed above the mounting bracket and connected to the circuit board; the sensitive element is connected to the mounting bracket and located between the circuit board and the pulse board, and the sensitive element is connected to the pulse board. A probe assembly includes a probe, a position sensing element, and a magnetic ring; the probe is hollow and connected to the base; the position sensing element is disposed inside the probe and connected to the sensing element; the magnetic ring is sleeved on the outer periphery of the probe and can move along the probe.

2. The displacement sensor according to claim 1, characterized in that, The mounting bracket includes: A base plate is connected to the base; a first positioning groove is provided on the end face of the base plate, and the first positioning groove penetrates the base plate; A vertical plate having a first end, a second end, and at least three clearance positions; the first end is connected to the end face of the base plate away from the base, and the second end is in contact with the top cover; two of the at least three clearance positions are respectively disposed at the first end and the second end; The circuit board and the pulse board are respectively disposed on both sides of the vertical plate; The sensitive element is disposed at the first positioning groove.

3. The displacement sensor according to claim 2, characterized in that, The mounting bracket also includes two sets of fixing bases; the two sets of fixing bases are respectively disposed on both sides of the vertical plate; The mounting bracket assembly includes at least two mounting brackets; the circuit board and the pulse board are respectively connected to the mounting brackets located on both sides of the vertical plate.

4. The displacement sensor according to claim 2, characterized in that, The displacement sensor also includes an insulating pad; the insulating pad is disposed between the sensitive element and the base.

5. The displacement sensor according to claim 4, characterized in that, The mounting bracket further includes a second positioning groove; the second positioning groove is arranged around the periphery of the first positioning groove.

6. The displacement sensor according to claim 2, characterized in that, The vertical plate has stepped surfaces on both sides of the second end.

7. The displacement sensor according to any one of claims 1 to 6, characterized in that, The probe assembly also includes an end; the end is located at the end of the probe away from the base.

8. The displacement sensor according to any one of claims 1 to 6, characterized in that, The probe assembly also includes a non-magnetic pad, which is disposed on the side of the magnetic ring away from the base.

9. The displacement sensor according to any one of claims 1 to 6, characterized in that, The displacement sensor also includes a connecting wire and a waterproof connector; the waterproof connector is disposed on the top cover, and the connecting wire is connected to the filter plate through the waterproof connector.

10. A ranging device, characterized in that, Includes the displacement sensor as described in any one of claims 1 to 9.

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